Telex MCE325 manual 1 Top cover removal, Switch Number, Switch Function, Default Setting

Figure 2.1 Top cover removal.

Intercom Line-Channel Configurations (DS1-DS3, J6, J7, J19 & J20)

The four channels of the MCE325 may be assigned to intercom lines in a variety of ways. Channel assignment is determined by the settings of DIP switches DS1 through DS3 and jumpers J6, J7, J19, and J20. There are six possible intercom line configurations. These are listed in Table 2.3 together with the proper DIP switch and jumper settings for each.

Table 2.1 DIP switch functions and default settings.

Switch Number	Switch Function	Default Setting
DS1	four-wire CH A output not installed (off), four-wire CH A output installed	Off
	(on)
DS2	four-wire CH B output not installed (off), four-wire CH B output installed	Off
	(on)
DS3	two-channel mode (off)*, four-channel mode (on)	Off
DS4	Front panel setup lock-out disabled (off), Front panel setup lock-out	Off
	enabled (on)
DS5	Listen and talk muted during ISO (off), Talk only muted during ISO (on)	Off
DS6	Not used	Off
DS7	Talk-off transmit disabled (off), Talk-off transmit enabled (on)	On
DS8	VOX disabled (off), VOX enabled (on)	Off

NOTE The terms “two-channel mode” and “four-channel mode” apply only to two-wire lines. In two- channel mode, each two-wire line uses two channel selector buttons: one for talk and one for listen. In four-channel mode, each two-wire line uses one channel selector button for both talk and listen.

The two-channel mode should be selected under only two circumstances:

1When only one or two two-wire lines are connected to channels one and two only.

2-2C S I - 2 0 0 U s e r I n s t r u c t i o n s